Film-shaped preparation comprising oily substances for oral administration

ABSTRACT

Water-soluble, solid, film-shaped preparations comprising at least one film-forming polymer selected from the group consisting of the fully and partially hydrolyzed polyvinyl alcohols, and at least one water-insoluble, oily liquid which is incorporated into the film-forming polymer and amounts to at least 30 percent by weight, relative to the dry portion of the preparation. Methods for producing the preparations and the use thereof are also provided.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Stage application of InternationalApplication No. PCT/EP2009/003138, filed on Apr. 30, 2009, which claimspriority of German application number 10 2008 023 345.5, filed on May13, 2008, both of which are incorporated herein by reference in theirentireties.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to solid, film-shaped preparationscomprising at least one oily substance for oral administration.

2. Description of the Prior Art

Flat-shaped forms of administration for use in the oral region and onthe mucous membranes of the mouth, so-called wafers, are known. U.S.Pat. No. 3,444,858 describes medicament strips based on agelatine-containing material. Also, medicaments in the form of filmswere already described at the beginning of the seventies, such as, forexample, in the New England Journal of Medicine, 289, 533-535 (1973).The utility model specification DE 24 49 865 describes activepharmaceutical ingredient carriers in the form of films that containvarious active ingredients and concentrations of active ingredients.

U.S. Pat. No. 4,128,445 discloses technical solutions for the loading ofcarrier material with active ingredients. In this connection, the patentaddresses the subsequent addition of active ingredient preparations ontoprefabricated film-shaped preparations. The document describes loadingmethods in dry and in moist form that aim at a uniform, subsequentdistribution of active ingredient on a layer.

Also known are proposals for active ingredient-loaded films forapplications outside the medical field. EP 0 219 762, for example,discloses a water-soluble film of starch, gelatine, glycerine or sorbitethat is coated using a roll coating process. In this connection, it isstated therein that such dosage forms may also be produced utilisingflavouring substances.

A formulation suited for producing film-shaped flavouringsubstance-containing preparations is described in EP 0 460 588. Acomposition of 20 to 60%-wt. film former, 2 to 40%-wt. gel former, 0.1to 35%-wt. active ingredient or flavouring substance, and not more than40%-wt. of an inert filler is considered to provide special advantages.Apart from other compounds, polyvinyl alcohol is mentioned as a gelformer. It has, however, emerged that the gel-forming properties ofpolyvinyl alcohol are only to a limited extent compatible with the filmformers mentioned in that printed publication. A content of 20 parts byweight, and more, of film former—mostly a sugar derivative, polyethyleneglycol, or the like—resulted in a considerable loss of aroma occurringalready in the drying of thin layers, which is part of the productionprocess.

Flavouring substance-containing forms of administration for applicationin the oral region are also known from EP 0 452 446, but this documentdoes not describe any measures to prevent an evaporation of flavouringsubstances during production and/or storage. As a solution to thatproblem, DE 196 52 257 discloses individually dosed, film-shaped formsof administration which rapidly disintegrate upon contact with a liquidand which can be produced avoiding loss of active ingredients duringtheir production and storage. These film-shaped forms of administrationhave an internal, liposoluble phase in the form of droplets that containthe flavouring substance and are present in an outer, solid butwater-soluble phase, with the outer phase comprising, relative to thewater-free portions, at least 40%-wt. of polyvinyl alcohol, up to30%-wt. of a surface-active substance and 0.1 to 30%-wt. of an internalphase, relative to the outer phase.

Film-shaped preparations for application in the mouth are alreadyavailable on the market as active ingredient-containing or flavouringsubstance-containing forms of administration. For example, wafer-thinstrips that leave a cool, breath-fresh taste sensation on the tonguewithout sucking or chewing are sold in the flavours “Peppermint”,“Wild-Mint” and “Lemon-Frost” by the company Wrigley under the namesECLIPSE FLASH®, or by the company Pfizer in the flavours “COOL MINT®”,“FRESHBURST®”, Cinnamon and “Fresh Citrus” under the trade markListerine POCKETPAKS®.

Hydrophilic, film-forming polymers are used to achieve a rapiddisintegration or rapid dissolution behaviour of film-shapedpreparations on contact with saliva.

However, if oily substances are to be administered with a film-shapedpreparation that rapidly dissolves in the oral cavity, the differingproperties of the matrix (=hydrophilic film-forming polymer) and of theoily substance (hydrophobic) which is to be incorporated in the matrixcause problems.

Since hydrophilic polymers usually only have a low absorption capacityfor lipophilic substances, the amount of oily substance with whichhydrophilic films can be loaded is limited. This limitation becomesparticularly apparent if larger amounts of an oily liquid are to beprocessed with a hydrophilic polymer into a film since in that case theoily substance exudes, for example due to phase separation occurringduring the preparation of the compound (separation of the oil-in-wateremulsion) or, later, during storage of the films.

However, for certain applications it is necessary to accommodate a largeamount of an oily substance in a film-shaped preparation. For example,to achieve a desired therapeutic effect it may be necessary to load thefilm with a large amount of an oily active ingredient. For example, forthe active ingredient simethicone, which is used as a carminative, adose of about 80 mg is indicated as therapeutically effective. Thisamount is administered, for example, by means of known liquid forms ofadministration. For an administration by means of a film-shapedpreparation rapidly disintegrating in the mouth, this amount wouldhowever be too large to be able to produce stable films.

To avoid the stability problems occurring during the loading of ahydrophilic film with a hydrophobic substance, surface-active substancesare usually added to a material consisting of a hydrophilic polymer anda hydrophobic, liquid or oily substance, i.e. tensides or emulsifierswhich reduce the interfacial surface tension between the phases. U.S.Pat. No. 6,177,096, for example, discloses the production of film-shapedforms of administration with addition of surface-active substances.

However, the use of surface-active substances in oral preparations isfrequently undesirable because it can have a negative impact on thetaste sensation by causing a soapy foreign taste. In addition, theamount of the surface-active substances added to the film-formingpolymer limits the possible total loading of the film with oilysubstance if the surface-active substances do not themselves possessfilm-forming properties as well.

SUMMARY OF THE PRESENT INVENTION

The problem to be solved by the present invention was therefore toprovide film-shaped preparations, rapidly disintegrating on contact withsaliva or other aqueous liquids, that are capable of stably containing alarge amount of at least one oily substance but do not comprise anyadditional surface-active substances.

Surprisingly, it was found that certain film-forming polymers are, evenwithout addition of further surface-active substances, capable ofstabilising larger amounts of oily substances and that stable films canbe produced therefrom.

The film-forming polymers that are capable of stabilising larger amountsof at least one oily substance even without addition of furthersurface-active substances are fully hydrolysed polyvinyl alcohols andpartially hydrolysed polyvinyl alcohols.

Polyvinyl alcohols are water-soluble polymers of vinyl alcohol. Vinylalcohol is generally present in the tautomeric form of the acetaldehyde.For this reason, polyvinyl alcohol cannot be produced by polymerisationof its monomers but is obtained by saponification of polyvinyl acetate.To this end, polyvinyl acetate is saponified, or hydrolysed, with sodiumhydroxide. The polyvinyl alcohols that have not been fully saponifiedwith sodium hydroxide contain vinyl alcohol units and vinyl acetateunits. These polyvinyl alcohols are referred to as partially hydrolysedpolyvinyl alcohols.

It is known that polyvinyl alcohol increases the surface-active effectof other tensides. Its good emulsifying capacity is likewise known(cosmetics, skin film, US 2005/0019291 A1). Although the simultaneoususe of polyvinyl alcohol as a film former and (possibly sole) emulsifierfor the production of stable, solid films comprising an oily componentfor oral application is mentioned in DE 196 52 257 A1, according toindications in this printed publication the portion of the internal(oily) phase is limited to a maximum of 30% (g/g), and the portion ofthe film former amounts to at least 40% (g/g), in each case relative tothe water-free total system.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

The water-soluble, solid, film-shaped preparations of the invention, bycontrast, comprise 30 to 80%-wt., preferably 40 to 60%-wt. of at leastone oily substance and 5 to 70%-wt., in the preferred embodiment 5 to60%-wt., of at least one partially hydrolysed or fully hydrolysedpolyvinyl alcohol. In a preferred embodiment, the water-soluble,film-shaped preparation comprises partially hydrolysed polyvinylalcohols, especially partially hydrolysed polyvinyl alcohols with adegree of hydrolysis of about 88%, that is, having a degree ofhydrolysis of 86.7 to 88.7%.

In a particularly preferred embodiment, the partially hydrolysedpolyvinyl alcohols have a degree of hydrolysis of about 88%, and aviscosity between 4 and 40 mPa·s as a 4% aqueous solution at 20° C. Thepolyvinyl alcohols available under the trade name MOWIOL® from KuraraySpecialities Europe GmbH, i.e. MOWIOL® 5-88, MOWIOL® 8-88, MOWIOL®13-88, MOWIOL® 18-88, MOWIOL® 23-88, MOWIOL® 26-88 and MOWIOL® 32-88,and comparable products, may be mentioned as examples of especiallypreferred partially hydrolysed polyvinyl alcohols.

Oily substances herein refers to substances that are liquid at roomtemperature (20° C. to 23° C.) and poorly water-soluble orwater-insoluble, mixtures of such substances and such substancescontaining components dissolved therein. Oily substances include, forexample, compounds such as the fatty oils (glyceryl esters of partiallyunsaturated fatty acids), mineral oils (carbohydrates that have beenobtained predominantly by distillation and refining from petroleum),synthetic oils (synthetically prepared oils, e.g. esters of dicarboxylicacids, silicone oils) and etherial oils (extracts of plants and parts ofplants consisting in large part of terpenes, and the synthetic copiesthereof).

The oily substances can be active pharmaceutical ingredients such asdimethicone or simethicone, but they may also have other functions, forexample as flavouring agents.

In preferred embodiments, the oily substance is dimethicone orsimethicone. Dimethicone, chemicallyα(trimethylsilyl)-ω-methylpoly[oxy(dimethylsilylene)], is a clear,colourless liquid that can be mixed with chloroform or ether, but is notmiscible with either water or ether. Simethicone is dimethicone mixedwith silicon dioxide. Both substances are active pharmaceuticalingredients that are administered perorally as antifoaming agents andcan alleviate bloating and pain caused by excess gas in thegastrointestinal tract. As a medicament, simethicone is available as achewing tablet or in liquid form. Preparation names for the medicamentsavailable on the market are, for example, ELUGAN®, ENDO-PARACTOL®,ESPUMISAN®, IMOGAS®, LEFAX® and SIMETHICON-RATIOPHARM®.

Further oily substances that may be contained in the preparation arementhol, bitter fennel oil, peppermint oil, caraway oil.

Peppermint oil (Menthae peperitae aetheroleum) is an ethereal oil thatis obtained from the peppermint plant (Mentha piperita). Peppermint oilis used as a carminative and is administered to treat spasms in theupper gastrointestinal tract and spasms of the bile ducts, due to itsdigestive and anti-bloating properties.

The main component of peppermint oil is menthol and menthone. Menthol isa monocyclic monoterpene alcohol which at 0.4 g/l is poorly soluble inwater. At room temperature, menthol is a colourless, crystalline solid.

Caraway oil (Carvi aetheroleum) is an ethereal oil that is obtained fromthe fully ripe fruits of the caraway plant (Carum carvi L.). It, too, isused as a carminative.

Bitter fennel oil is an ethereal oil of German fennel (Foeniculi amariFructus) which is obtained by steam distillation from the seeds. Bitterfennel oil is, inter alia, digestive and has a spasmolysant effect inthe gastrointestinal tract.

The preparation according to the invention may consist of 5 to 70%-wt.of at least one partially or fully hydrolysed polyvinyl alcohol and of30 to 80%-wt. of at least one oily substance. The portion of partiallyor fully hydrolysed polyvinyl alcohol preferably amounts to 40 to60%-wt., and the portion of oily substance to 40 to 60%-wt.

In a preferred embodiment, the film-shaped preparation according to theinvention consists of 40%-wt. of at least one partially or fullyhydrolysed polyvinyl alcohol and of 60%-wt. of at least one oilysubstance, preferably dimethicone or simethicone, in each case relativeto the dry portion.

In particularly preferred embodiments, the preparation comprises, inaddition to dimethicone or simethicone, at least one ethereal oil fromthe group comprising peppermint oil, bitter fennel oil and caraway oil.

The invention is, however, not limited to water-soluble, solid,film-shaped preparations of at least one polyvinyl alcohol and one ormore oily substances. In preferred embodiments, the film-shapedpreparation may contain further hydrophilic polymers, even if with theseadditional polymers it is not possible to produce stable filmscomprising an oily substance in a large amount if only these polymersare used as the matrix material and no further surface-active substancesare added.

The additional hydrophilic polymers are preferably selected from thegroup comprising cellulose and cellulose derivatives, polyvinylpyrrolidones, polyethylene oxides, pullulan, hydroxypropylated tapiocastarch and alginates. In a particularly preferred embodiment, theadditional hydrophilic polymers are selected from the group consistingof hydroxypropyl methyl cellulose and sodium carboxymethyl cellulose.

The film-shaped preparations may contain further excipients oradditives. For example, glycerine, sorbidex, sucralose, menthol and/orcolourants may be added to the polymer material to prepare thefilm-shaped preparation.

The amounts in which the preferred components may be contained in thefilm-shaped preparation are summarised in Table 1:

TABLE 1 Amounts of the components contained in the preparation ComponentContent Polyvinyl alcohol 5-70%-wt. (fully/partially hydrolysed) Oilycomponent 30-80%-wt.  Hydroxypropyl methyl cellulose 0-35%-wt. Sodiumcarboxymethyl cellulose 0-35%-wt. Glycerine 0-20%-wt. Sorbidex 0-20%-wt.Sucralose  0-2%-wt. Menthol 0-10%-wt. Bitter fennel oil  0-5%-wt.Peppermint oil  0-5%-wt. Caraway oil  0-5%-wt. Total  100%-wt.

The invention also relates to methods for producing the preparationsaccording to the invention. The preparations according to the inventioncan be produced by preparing a material containing at least onefilm-forming polymer from the group of the fully and partiallyhydrolysed polyvinyl alcohols and at least 30%-wt., relative to the dryportion of the preparation, of a water-insoluble, oily liquid in anaqueous solvent, preferably water. This material is then coated on asupport, and the resultant coating is dried.

The film-shaped preparations which contain dimethicone, simethicone,peppermint oil, bitter fennel oil and/or caraway oil as the oilysubstance, can be used as carminatives as they can alleviate complaintsin the region of the gastrointestinal tract, such as bloating, spasmsand/or flatulence.

EXAMPLES

To examine the absorption capacity of hydrophilic, film-forming polymersfor oily substances more closely, different amounts of simethicone wereprocessed into films in combination with different polymers by initiallymixing an aqueous polymer solution with simethicone. This mixture wascoated on a support, and the coating was dried.

Example 1

A homogeneous material of the following composition was prepared:

16%-wt. Polyvinyl alcohol (MOWIOL ® 8-88, partially hydrolysed polyvinylalcohol, degree of hydrolysis: 85-89%, viscosity (4% in H₂O, 20° C.: 7-9mPa · s) 24%-wt. Simethicone 60%-wt. WaterFilms prepared with this material remained stable.

Example 2

A homogeneous material of the following composition was prepared:

14%-wt. Sodium carboxymethyl cellulose (WALOCEL ® CRT 30 GA; DS:0.65-1.45, viscosity (2%): 20-40 mPa · s)  6%-wt. Simethicone 80%-wt.WaterHowever, owing to wetting problems it was not possible to preparecoatings with this material that had no defects.

Example 3

A homogeneous material of the following composition was prepared:

21%-wt. Polyvinyl pyrrolidone (KOLLIDON ® 90; K-value: 81.0- 96.3) 9%-wt. Simethicone 70%-wt. WaterFilms prepared with this material exuded simethicone.

Example 4

A homogeneous material of the following composition was prepared:

17.5%-wt. Polyethylene oxide (POLYOX ® WSR N80; viscosity (5%, 25° C.):55-90 cP)  7.5%-wt. Simethicone 75.0%-wt. WaterFilms prepared with this material exuded simethicone.

Example 5

A homogeneous material of the following composition was prepared:

28%-wt. Pullulan (PI-20; viscosity: 128 mm²/s) 12%-wt. Simethicone60%-wt. WaterOwing to wetting problems, it was not possible to prepare coatings withthis material that had no defects. In addition, films prepared with thismaterial exuded simethicone.

Example 6

A homogeneous material of the following composition was prepared:

4.4%-wt. sodium alginate (MANUCOL ® LDP MCLLDP 25BG; viscosity (1%):4.00-15.00) 6.6%-wt. Simethicone 89.0%-wt.  WaterFilms prepared with this material exuded simethicone.

Example 7

A homogeneous material of the following composition was prepared:

10.4%-wt. Hydroxypropyl cellulose (KLUCEL ® LF; viscosity (5%): 75-150mPa · s) 15.6%-wt. Simethicone 74.0%-wt. WaterFilms prepared with this material exuded simethicone.

As is shown by Example 1, it was possible to prepare stable films frompartially hydrolysed polyvinyl alcohol which contained a portion of60%-wt. of simethicone, relative to the dry portion. With otherhydrophilic, film-forming polymers, it was not possible to preparestable films, as is shown by the examples 2 to 8, which are to beregarded as comparative examples.

Example 8

Example of a recipe for a stable film with simethicone:

27.48%-wt.  MOWIOL ® 8-88 58.00%-wt.  Simethicone 10.00%-wt.  Peppermintflavour 1.00%-wt. Sucralose 2.50%-wt. Sorbidex 1.00%-wt. Titaniumdioxide 0.02%-wt. Patent blue

Example 9

Example of a recipe for a stable film with simethicone:

26.09%-wt.  MOWIOL ® 8-88 7.00%-wt. Pharmacoat 606 (hydroxypropyl methylcellulose; substitution type 2910, viscosity (2%-wt. in H₂O): 4.8-7.2mPa · s) 0.50%-wt. WALOCEL ®CRT 30 GA 57.14%-wt.  Simethicone 3.00%-wt.Glycerine 3.00%-wt. Sorbidex 0.35%-wt. Sucralose 0.40%-wt. Menthol1.00%-wt. Bitter fennel oil 1.00%-wt. Peppermint oil 0.50%-wt. Carawayoil 0.02%-wt. Yellow No. 6

What has been described above are preferred aspects of the presentinvention. It is of course not possible to describe every conceivablecombination of components or methodologies for purposes of describingthe present invention, but one of ordinary skill in the art willrecognize that many further combinations and permutations of the presentinvention are possible. Accordingly, the present invention is intendedto embrace all such alterations, combinations, modifications, andvariations that fall within the spirit and scope of the appended claims.

We claim:
 1. A water-soluble, solid, dried film-shaped preparationcomprising at least one film-forming polymer selected from the groupconsisting of fully and partially hydrolysed polyvinyl alcohols, and atleast one oily substance that is incorporated into the film-formingpolymer in amounts to at least 50 percent by weight, said preparationcontaining at least one oily substance selected from the groupconsisting of silicone oils wherein the film-shaped preparation does notexude said at least one oily substance.
 2. The preparation according toclaim 1, wherein the partially hydrolysed polyvinyl alcohols arerespectively selected from the group consisting of the partiallyhydrolysed polyvinyl alcohols having a degree of hydrolysis of about88%.
 3. The preparation according to claim 1, wherein the partiallyhydrolysed polyvinyl alcohols respectively have a viscosity of 4 to 40mPa·s as a 4% aqueous solution.
 4. The preparation according to claim 1,wherein said preparation further contains at least one ethereal oilselected from the group consisting of bitter fennel oil, peppermint oiland caraway oil.
 5. The preparation according to claim 1, wherein saidpreparation comprises at least one further hydrophilic polymer.
 6. Thepreparation according to claim 5, wherein said at least one furtherhydrophilic polymer is selected from the group consisting of celluloses,cellulose derivatives, polyvinyl pyrrolidones, polyethylene oxides,pullulan, hydroxypropylated tapioca starch and alginates.
 7. Thepreparation according to claim 1, wherein said preparation comprises atleast one excipient or additive.
 8. The preparation according to claim1, wherein said preparation comprises a composition according to thefollowing table: Component Content Polyvinyl alcohol 5-70%-wt.(fully/partially hydrolysed) Oily component, as defined in claim 130-80%-wt.  Hydroxypropyl methyl cellulose 0-35%-wt. Sodiumcarboxymethyl cellulose 0-35%-wt. Glycerine 0-20%-wt. Sorbidex 0-20%-wt.Sucralose  0-2%-wt. Menthol 0-10%-wt. Bitter fennel oil  0-5%-wt.Peppermint oil  0-5%-wt. Caraway oil  0-5%-wt. Total  100%-wt.


9. The preparation according to claim 1, wherein said preparationcontains no surface-active agents.
 10. The preparation according toclaim 1, wherein the at least one oily substance is selected from thegroup consisting of simethicone and dimethicone.
 11. The preparationaccording to claim 1, wherein the at least one oily substance amounts tonot more than 80%-wt. relative to the dry portion of the preparation.12. The preparation according to claim 11, wherein the at least one oilysubstance amounts to not more than 60%-wt., relative to the dry portionof the preparation.
 13. The preparation according to claim 7, whereinsaid at least one excipient or additive is selected from the groupconsisting of glycerine, sorbidex, sucralose, menthol and colourants.14. A method for producing a preparation according to claim 1,comprising the steps of: coating a support with a material comprising atleast one fully or partially hydrolyzed polyvinyl alcohol and at least50 percent by weight, relative to the dry portion of the preparation, ofan oily substance as defined in claim 1, in an aqueous solvent, to forma coating; and drying said coating.
 15. The method according to claim14, wherein the solvent is water.
 16. The method according to claim 14,wherein said method takes place without the addition of surface-activeagents.
 17. The method according to claim 14, wherein said at least oneoily substance is selected from the group consisting of simethicone anddimethicone.
 18. A method of using the film-shaped preparation accordingto claim 1 as a carminative for treating complaints of thegastrointestinal tract comprising the step of administering thefilm-shaped preparation to an individual in need thereof.